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small question


Dear Group

I have two variables multiplied by each other

N1 x    (N1 times x) which is a part of an equation.

What i want to do is to replace  this multiplication by Nx1 (one
variable) and i want to do this automatically using Mathematica,
because i have a huge number of such terms, for example, N2 y, N3 z,
N4 x, N5 y.... etc.

Thereofore, i need to get this transformation:

N1 x ------> Nx1
N2 y ------> Ny2
N3 z ------> Nz3
and so on.

Please notice that the letter N doesn't change only numbers(1,2,...)
and (x,y,z....) do.


Any help in this regard is highly appreciated.



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